IMO Level 1 Mathematics Olympiad (SOF) Class 10: Questions 570  573 of 968
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Question number: 570
Question
Walking at threefourths of his usual speed a man covers a certain distance in two hours than the time he takes to cover the distance at his usual speed. The time taken by him to cover the distance with his usual speed is ________
Choices
Choice (4)  Response  

a.  5.5 hours  
b.  4.5 hours  
c.  5 hours  
d.  6 hours 
Question number: 571
Question
The ratio between the ages of Dipti and Cristal at present is . Three years hence the ratio of their ages will be . What is the present age of Cristal?
Choices
Choice (4)  Response  

a.  28 years  
b.  26 years  
c.  24 years  
d.  27 years 
Question number: 572
Question
Shivam buys a watch for Rs. 1,60,000. He pays half of the amount in cash and agrees to pay the balance in 12 annual instalments of Rs. 6000 each. If the rate of interest is and he pays with the instalment the interest due on the unpaid amount, find the total cost of the watch.
Choices
Choice (4)  Response  

a.  6,28,000  
b.  9,84,800  
c.  5,27,750  
d.  8,27,000 
Question number: 573
Question
A train 200 meters long moving at a speed of 70 km/hr crosses a train 220 meters long coming from opposite direction in 10 seconds. The speed of second train is ________
Choices
Choice (4)  Response  

a. 
 
b. 
 
c. 
 
d. 
